Silicon Detector Dark Matter Results from the Final Exposure of CDMS II
We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2014
|
| Online Access: | http://hdl.handle.net/1721.1/85210 https://orcid.org/0000-0002-4435-4623 https://orcid.org/0000-0001-9285-5556 |
| _version_ | 1826209139013976064 |
|---|---|
| author | Anderson, Adam Jonathan Billard, Julien Figueroa-Feliciano, Enectali Hertel, Scott Alexander Leman, Steven W. McCarthy, Kevin Ahmad |
| author2 | Lincoln Laboratory |
| author_facet | Lincoln Laboratory Anderson, Adam Jonathan Billard, Julien Figueroa-Feliciano, Enectali Hertel, Scott Alexander Leman, Steven W. McCarthy, Kevin Ahmad |
| author_sort | Anderson, Adam Jonathan |
| collection | MIT |
| description | We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41[+0.20 over −0.08](stat)[+0.28 over −0.24](syst). Other known backgrounds from neutrons and [superscript 206]Pb are limited to < 0.13 and < 0.08 events at the 90% confidence level, respectively. The exposure of this analysis is equivalent to 23.4 kg day for a recoil energy range of 7–100 keV for a WIMP of mass 10 GeV/c[superscript 2]. The probability that the known backgrounds would produce three or more events in the signal region is 5.4%. A profile likelihood ratio test of the three events that includes the measured recoil energies gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP + background hypothesis. The highest likelihood occurs for a WIMP mass of 8.6 GeV/c[superscript 2] and WIMP-nucleon cross section of 1.9 × 10[superscript −41] cm[superscript 2]. |
| first_indexed | 2024-09-23T14:17:52Z |
| format | Article |
| id | mit-1721.1/85210 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:17:52Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/852102022-09-28T19:50:30Z Silicon Detector Dark Matter Results from the Final Exposure of CDMS II Anderson, Adam Jonathan Billard, Julien Figueroa-Feliciano, Enectali Hertel, Scott Alexander Leman, Steven W. McCarthy, Kevin Ahmad Lincoln Laboratory Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Anderson, Adam Jonathan Billard, Julien Figueroa-Feliciano, Enectali Hertel, Scott Alexander Leman, Steven W. McCarthy, Kevin Ahmad We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41[+0.20 over −0.08](stat)[+0.28 over −0.24](syst). Other known backgrounds from neutrons and [superscript 206]Pb are limited to < 0.13 and < 0.08 events at the 90% confidence level, respectively. The exposure of this analysis is equivalent to 23.4 kg day for a recoil energy range of 7–100 keV for a WIMP of mass 10 GeV/c[superscript 2]. The probability that the known backgrounds would produce three or more events in the signal region is 5.4%. A profile likelihood ratio test of the three events that includes the measured recoil energies gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP + background hypothesis. The highest likelihood occurs for a WIMP mass of 8.6 GeV/c[superscript 2] and WIMP-nucleon cross section of 1.9 × 10[superscript −41] cm[superscript 2]. National Science Foundation (U.S.) (Grant AST-9978911) National Science Foundation (U.S.) (Grant NSF-0847342) National Science Foundation (U.S.) (Grant NSF-1151869) National Science Foundation (U.S.) (Grant PHY-0542066) National Science Foundation (U.S.) (Grant PHY-0503729) National Science Foundation (U.S.) (Grant PHY-0503629) National Science Foundation (U.S.) (Grant PHY-0503641) National Science Foundation (U.S.) (Grant PHY-0504224) National Science Foundation (U.S.) (Grant PHY-0705052) National Science Foundation (U.S.) (Grant PHY-0801708) National Science Foundation (U.S.) (Grant PHY-0801712) National Science Foundation (U.S.) (Grant PHY-0802575) National Science Foundation (U.S.) (Grant PHY-0847342) National Science Foundation (U.S.) (Grant PHY-0855299) National Science Foundation (U.S.) (Grant PHY-0855525) National Science Foundation (U.S.) (Grant PHY-1102795) National Science Foundation (U.S.) (Grant PHY-1205898) United States. Dept. of Energy (Contract DE-AC03-76SF00098) United States. Dept. of Energy (Contract DE-FG02-92ER40701) United States. Dept. of Energy (Contract DE-FG02-94ER40823) United States. Dept. of Energy (Contract DE-FG03-90ER40569) United States. Dept. of Energy (Contract DE-FG03-91ER40618) United States. Dept. of Energy (Contract DE-SC0004022) 2014-03-03T15:50:21Z 2014-03-03T15:50:21Z 2013-12 2013-07 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/85210 Agnese, R., Z. Ahmed, A. Anderson, S. Arrenberg, D. Balakishiyeva, R. Basu Thakur, D. Bauer, et al. “Silicon Detector Dark Matter Results from the Final Exposure of CDMS II.” Physical Review Letters 111, no. 25 (December 2013). © 2013 American Physical Society https://orcid.org/0000-0002-4435-4623 https://orcid.org/0000-0001-9285-5556 en_US http://dx.doi.org/10.1103/PhysRevLett.111.251301 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society American Physical Society |
| spellingShingle | Anderson, Adam Jonathan Billard, Julien Figueroa-Feliciano, Enectali Hertel, Scott Alexander Leman, Steven W. McCarthy, Kevin Ahmad Silicon Detector Dark Matter Results from the Final Exposure of CDMS II |
| title | Silicon Detector Dark Matter Results from the Final Exposure of CDMS II |
| title_full | Silicon Detector Dark Matter Results from the Final Exposure of CDMS II |
| title_fullStr | Silicon Detector Dark Matter Results from the Final Exposure of CDMS II |
| title_full_unstemmed | Silicon Detector Dark Matter Results from the Final Exposure of CDMS II |
| title_short | Silicon Detector Dark Matter Results from the Final Exposure of CDMS II |
| title_sort | silicon detector dark matter results from the final exposure of cdms ii |
| url | http://hdl.handle.net/1721.1/85210 https://orcid.org/0000-0002-4435-4623 https://orcid.org/0000-0001-9285-5556 |
| work_keys_str_mv | AT andersonadamjonathan silicondetectordarkmatterresultsfromthefinalexposureofcdmsii AT billardjulien silicondetectordarkmatterresultsfromthefinalexposureofcdmsii AT figueroafelicianoenectali silicondetectordarkmatterresultsfromthefinalexposureofcdmsii AT hertelscottalexander silicondetectordarkmatterresultsfromthefinalexposureofcdmsii AT lemanstevenw silicondetectordarkmatterresultsfromthefinalexposureofcdmsii AT mccarthykevinahmad silicondetectordarkmatterresultsfromthefinalexposureofcdmsii |